Troubleshooting and Maintenance

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1 6 In This Chapter... page... 2 Monitoring Trip Events, History, & Conditions.. 5 Restoring Factory Default Settings... 8 Maintenance and Inspection... 9 Warranty... 16

2 6 2 Safety Messages Please read the following safety messages before troubleshooting or performing maintenance on the inverter and motor system. WARNING: Wait at least five (5) minutes after turning OFF the input power supply before performing maintenance or an inspection. Otherwise, there is the danger of electric shock. WARNING: Make sure that only qualified personnel will perform maintenance, inspection, and part replacement. Before starting to work, remove any metallic objects from your person (wristwatch, bracelet, etc.). Be sure to use tools with insulated handles. Otherwise, there is a danger of electric shock and/or injury to personnel. WARNING: Never remove connectors by pulling on its wire leads (wires for cooling fan and logic P.C.board). Otherwise, there is a danger of fire due to wire breakage and/or injury to personnel. General Precautions and Notes Always keep the unit clean so that dust or other foreign matter does not enter the inverter. Take special care in regard to breaking wires or making connection mistakes. Firmly connect terminals and connectors. Keep electronic equipment away from moisture and oil. Dust, steel filings and other foreign matter can damage insulation, causing unexpected accidents, so take special care. Inspection Items This chapter provides instructions or checklists for these inspection items: Daily inspection Periodic inspection (approximately once a year) Insulation resistance test

3 L100 Inverter 6 3 Tips The table below lists typical symptoms and the corresponding solution(s). Symptom/condition Probable Cause Solution The motor will not run. The inverter outputs [U], [V], [W] are not supplying voltage. Inverter outputs [U], [V], [W] are supplying voltage. The optional remote operator is used (SRW). The direction of the motor is reversed. Is the frequency command source A_01 parameter setting correct? Is the Run command source A_02 parameter setting correct? Is power being supplied to terminals [L1], [L2], and [L3/N]? If so, the POWER lamp should be ON. Is there an error code E X X displayed? Are the signals to the intelligent input terminals correct? Is the Run Command active? Is the [FW] terminal (or [RV]) connected to [P24] (via switch, etc.) Has the frequency setting for F_01 been set greater than zero? Are the control circuit terminals [H], [O], and [L] connected to the potentiometer? Is the RS (reset) function or FRS (free-run stop) function ON? Is the motor load too heavy? Are the operational settings between the remote operator and the inverter unit correct? Are the connections of output terminals [U/T1], [V/T2], and [W/T3] correct? Is the phase sequence of the motor forward or reverse with respect to [U/T1], [V/T2], and [W/T3]? Are the control terminals [FW] and [RV] wired correctly? Is parameter F_04 properly set? Make sure the parameter setting A_01 is correct. Make sure the parameter setting A_02 is correct. Check terminals [L1], [L2], and [L3/N], then [U/T1], [V/T2], and [W/T3]. Turn ON the power supply or check fuses. Press the Func. key and determine the error type. Eliminate the error cause, then clear the error (Reset). Verify the terminal functions for C_01 C_05 are correct. Turn ON Run Command enable. Supply 24V to [FW] or [RV] terminal, if configured. Set the parameter for F_01 to a safe, non-zero value. If the potentiometer is the frequency setting source, verify voltage at [O] > 0V. Turn OFF the command(s). Reduce load, and test the motor independently. Check the operator type setting. Make connections according to the phase sequence of the motor. In general: FWD = U-V-W, and REV=U-W-V. Use terminal [FW] for forward, and [RV] for reverse. Set motor direction in F_04.

4 6 4 Symptom/condition Probable Cause Solution The motor speed will not reach the target frequency (desired speed). The rotation is unstable. The RPM of the motor does not match the inverter output frequency setting. Inverter data is not correct. A parameter will not change after an edit (reverts to old setting). No downloads have occurred. A download to the inverter was attempted. True for certain parameters True for all parameters If using the analog input, is the current or voltage at [O] or [OI]? Is the load too heavy? Is the inverter internally limiting the output frequency? Is the load fluctuation too great? Is the supply voltage unstable? Is the problem occurring at a particular frequency? Is the maximum frequency setting A_04 correct? Does the monitor function D_01 display the expected output frequency? Was power turned OFF after a parameter edit but before pressing the Store key? Edits to data are permanently stored at power down. Was the time from power OFF to power ON less than six seconds? Was the power turned OFF within six seconds after the display changed from REMT to INV? Is the inverter in Run Mode? Some parameters cannot be edited during Run Mode. If you re using the [SFT] intelligent input (software lock function) is the [SFT] input ON? Check the wiring. Check the potentiometer or signal generating device. Reduce the load. Heavy loads activate the overload restriction feature (reduces output as needed). Check max frequency setting (A_04) Check frequency upper limit setting (A_61) Increase the motor capacity (both inverter and motor). Fix power supply problem. Change the output frequency slightly, or use the jump frequency setting to skip the problem frequency. Verify the V/f settings match motor specifications. Make sure all scaling (such as A_11 to A_14) is properly set. Edit the data and press the Store key once. Wait six seconds or more before turning power OFF after editing data. Copy the data to the inverter again, and keep power ON for six seconds or more after copying. Put inverter in Stop Mode (press the Stop/reset key). Then edit the parameter. Change the state of the SFT input, and check the B_31 parameter (SFT mode).

5 L100 Inverter 6 5 Monitoring Trip Events, History, & Conditions Fault Detection and Clearing The microprocessor in the inverter detects a variety of fault conditions and captures the event, recording it in a history table. The inverter output turns OFF, or trips similar to the way a circuit breaker trips due to an over-current condition. Most faults occur when the motor is running (refer to the diagram to the right). However, the inverter could have an internal fault and trip in Stop Mode. In Fault Run either case, you can clear the fault by pressing the Stop/Reset key. Additionally, you can clear the inverter s cumulative trip history by performing the procedure Restoring Factory Default Settings on page 6 8 (setting B_84=00 will clear the trip history but leave inverter settings intact). STOP RESET Trip RUN STOP RESET Stop Fault Error Codes An error code will appear on the display automatically when a fault causes the inverter to trip. The following table lists the cause associated with the error. Error Code E01 E02 E03 Name Over current event while at constant speed Over current event during deceleration Over current event during acceleration Cause(s) The inverter output was short-circuited, or the motor shaft is locked or has a heavy load. These conditions cause excessive current for the inverter, so the inverter output is turned OFF. The dual-voltage motor is wired incorrectly. E04 Over current event during other conditions E05 Overload protection When a motor overload is detected by the electronic thermal function, the inverter trips and turns OFF its output. E07 Over voltage protection When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor. E08 EEPROM error When the built-in EEPROM memory has problems due to noise or excessive temperature, the inverter trips and turns OFF its output to the motor. E09 Under-voltage error A decrease of internal DC bus voltage below a threshold results in a control circuit fault. This condition can also generate excessive motor heat or cause low torque. The inverter trips and turns OFF its output. E1 1 CPU error A malfunction in the built-in CPU has occurred, so the inverter trips and turns OFF its output to the E22 motor.

6 6 6 Monitoring Trip Events, History, & Conditions Error Code Name E1 2 External trip A signal on an intelligent input terminal configured as EXT has occurred. The inverter trips and turns OFF the output to the motor. E1 3 USP When the Unattended Start Protection (USP) is enabled, an error occurred when power is applied while a Run signal is present. The inverter trips and does not go into Run Mode until the error is cleared. E1 4 Ground fault The inverter is protected by the detection of ground faults between the inverter output and the motor during powerup tests. This feature protects the inverter, and does not protect humans. E1 5 Input over-voltage When the input voltage is higher than the specified value, it is detected 100 seconds after powerup and the inverter trips and turns OFF its output. E21 Inverter thermal trip When the inverter internal temperature is above the threshold, the thermal sensor in the inverter module detects the excessive temperature of the power devices and trips, turning the inverter output OFF. E35 Thermistor When a thermistor is connected to terminals [5] and [CM1] and the inverter has sensed the temperature is too high, the inverter trips and turns OFF the output. ---U Under-voltage (brownout) with output shutoff Cause(s) Due to low input voltage, the inverter turns its output OFF and tries to restart. If it fails to restart, then the alarm trips to record the under-voltage error event. NOTE: If an EEPROM error (E08) occurs, be sure to confirm the parameter data values are still correct. If the power is turned OFF while the [RS] (Reset) intelligent input terminal is ON, an EEPROM error will occur when power is restored.

7 L100 Inverter 6 7 Trip History and Inverter Status We recommend that you first find the cause of the fault before clearing it. When a fault occurs, the inverter stores important performance data at the moment of the fault. To access the data, use the monitor functions (D_xx) and select D_08 for details about the present fault (E n ), or the error code for the past two trip events (E n-1 and E n-2 ) using the D_09 Trip History function. The following Monitor Menu map shows how to access the error codes. When fault(s) exist, you can review their details by first selecting the proper function: D_08 displays current trip data, and D_09 displays trip history. Monitor Menu 2 d d d 09 2 Error exists? Yes No Current Trip Conditions Error (n-1) exists? Yes No Trip History No history E Error Code Output frequency at trip point Motor current at trip point DC bus voltage at trip point Error (n-2) exists? Yes Previous error #1 E03 E05 No Previous error #2 No history No error

8 6 8 Restoring Factory Default Settings Restoring Factory Default Settings You can restore all inverter parameters to the original factory (default) settings for the intended country of use. After initializing the inverter, use the powerup test in Chapter 2 to get the motor running again. To initialize the inverter, follow the steps below. No. Action Display Func./Parameter 1 2 Use the, 1, and 2 keys to navigate to the B Group. b -- Press the key. b 01 B Group selected First B parameter selected 3 4 Press and hold the key until -> Press the key. 02 Country code for initialization selected 00 = Japan, 01 = Europe, 02 = U.S. 5 Confirm the country code is correct. Do not change it unless you are absolutely sure the power input voltage range and frequency match the country code setting. To change the country code, press 1 or 2 to set, STR to store Press the key. b 85 Press the key. Press the key. 00 Press the 1 key. 01 Press the STR key. b 84 Press and hold the, 1, and 2 keys. Do not release yet. 12 Holding the keys above, press and STOP hold the RESET (STOP) key for 3 sec. 13 STOP Release only the (STOP) key, and wait for the display d 0 1 to appear and begin blinking Now release the,, and keys only after the d 0 1 display function begins blinking. 1 b 85 b 84 b 84 b 84 RESET d EU USA Country code for initialization selected Initialization function selected 00 = initialization disabled, clear fault history only 01 = initialization enabled Initialization now enabled to restore all defaults First part of special key sequence Final part of special key sequence Initialization begins when display starts blinking Default parameter country code shown during initialization process (left-most char displays alternating pattern) 15 Initialization is complete. Function code for output d 01 frequency monitor shown NOTE: Initialization cannot be performed with a remote operator panel. Disconnect the device and use the inverter s front panel keypad.

9 L100 Inverter 6 9 Maintenance and Inspection Monthly and Yearly Inspection Chart Overall Main circuit Item Inspected Ambient environment Major devices Power supply voltage Ground Insulation Mounting Check for... Extreme temperatures & humidity Abnormal noise & vib. Voltage tolerance Adequate resistance No loose screws Inspection Cycle Month Year Inspection Method Thermometer, hygrometer Criteria Ambient temperature between -10 to 40 C, non-condensing Visual and aural Stable environment for electronic controls Digital volt meter, measure between inverter terminals [L1], [L2], [L3] Digital volt meter, GND to terminals 200V class: 200 to 240V 50/60 Hz 400V class: 380 to 460V 50/60 Hz 5 Meg. Ohms or greater Torque wrench M3: Nm M4: Nm M5: Nm Components Overheating Thermal trip No trip events events Housing Dirt, dust Visual Vacuum dust and dirt Terminal block Secure connections Visual No abnormalities Smoothing capacitor Leaking, swelling Visual No abnormalities Relay(s) Chattering Aural Single click when switching ON or OFF Resistors Cracks or discoloring Cooling fan Noise Power down, manually rotate Visual Use Ohm meter to check braking resistors Rotation must be smooth Dust Visual Vacuum to clean Control circuit Overall Capacitor No odor, discoloring, corrosion No leaks or deformation Visual No abnormalities Visual Undistorted appearance Display LEDs Legibility Visual All LED segments work Note 1: Note 2: The life of a capacitor is affected by the ambient temperature. See Capacitor Life Curve on page The inverter must be cleaned periodically. If dust accumulates on the fan and heat sink, it can cause overheating of the inverter.

10 6 10 Maintenance and Inspection Megger Test The megger is a piece of test equipment that uses a high voltage to determine if an insulation degradation has occurred. For inverters, it is important that the power terminals be isolated from the Earth GND terminal via the proper amount of insulation. The circuit diagram below shows the inverter wiring for performing the megger test. Just follow the steps to perform the test: 1. Remove power from the inverter and wait at least 5 minutes before proceeding. 2. Open the front housing panel to access the power wiring. 3. Remove all wires to terminals [R, S, T, +1, +,, U, V, and W]. Most importantly, the input power and motor wires will be disconnected from the inverter. 4. Use a bare wire and short terminals [R, S, T, +1, +,, U, V, and W] together as shown in the diagram. 5. Connect the megger to the inverter Earth GND and to the shorted power terminals as shown. Then perform the megger test at 500 VDC and verify 5MΩ or greater resistance. Add test jumper wire Disconnect power source R L100 U Disconnect motor wires S V Motor T W Earth GND +1 + Megger, 500VDC 6. After completing the test, disconnect the megger from the inverter. 7. Reconnect the original wires to terminals [R, S, T, +1, +,, U, V, and W]. CAUTION: Do not connect the megger to any control circuit terminals such as intelligent I/O, analog terminals, etc. Doing so could cause damage to the inverter. CAUTION: Never test the withstand voltage (HIPOT) on the inverter. The inverter has a surge protector between the main circuit terminals above and the chassis ground.

11 L100 Inverter 6 11 Spare parts We recommend that you stock spare parts to reduce down time, including these parts: Part description Symbol Used Quantity Spare Notes Cooling fan FAN NF, 037LF, 015HF to 075HF Case CV 1 1 Front case Key cover Case Bottom cover Capacitor Life Curve The DC bus inside the inverter uses a large capacitor as shown in the diagram below. The capacitor handles high voltage and current as it smooths the power for use by the inverter. So, any degradation of the capacitor will affect the performance of the inverter. Power Input L1 Con- Variable-frequency Drive Internal DC Bus + Inverter Motor L2 L3 Rectifier + U/T1 V/T2 W/T3 Capacitor Capacitor life is reduced in higher ambient temperatures, as the graph below demonstrates. Be sure to keep the ambient temperature at acceptable levels, and perform maintenance inspections on the fan, heat sink, and other components. If the inverter is installed on a cabinet, the ambient temperature is the temperature inside the cabinet. Ambient temperature, C Capacitor Life Curve Operation for 12 hours/day Years

12 6 12 Maintenance and Inspection General Inverter Electrical Measurements The following table specifies how to measure key system electrical parameters. The diagrams on the next page show inverter-motor systems and the location of measurement points for these parameters. Parameter Supply voltage E 1 Circuit location of measurement E R across L1 and L2 E S across L2 and L3 E T across L3 and L1 Measuring instrument Moving-coil type voltmeter or rectifier type voltmeter Notes Fundamental wave effective value Supply current I r L1, I s L2, I t L3 Total effective I 1 value Supply power W 1 W 11 across L1 and L2 W 12 across L2 and L3 Total effective value Reference Value Commercial supply voltage (200V class) V, 50/60 Hz 400V class V, 50/60 Hz Supply power W factor Pf 1 1 Pf 1 = % 3 E 1 I 1 Output voltage E 0 Output current I o Output power W o E U across U and V E V across V and W E W across W and U I U U I V V I W W W 01 across U and V W 02 across V and W Rectifier type voltmeter Moving-coil ammeter Electronic type wattmeter Total effective value Total effective value Total effective value Output power Calculate the output power factor from the output voltage E, factor Pf o output current I, and output power W. W 0 Pf 0 = % 3 E 0 I 0 Note 1: Note 2: Note 3: Use a meter indicating a fundamental wave effective value for voltage, and meters indicating total effective values for current and power. The inverter output has a distorted waveform, and low frequencies may cause erroneous readings. However, the measuring instruments and methods listed above provide comparably accurate results. A general-purpose digital volt meter (DVM) is not usually suitable to measure a distorted waveform (not pure sinusoid).

13 L100 Inverter 6 13 The figures below show measurement locations for voltage, current, and power measurements listed in the table on the previous page. The voltage to be measured is the fundamental wave effective voltage. The power to be measured is the total effective power. Single-phase Measurement Diagram L1 I 1 L1 U I 1 E 1 W 1 INVERTER V I 1 E U-V W 01 T1 T2 MOTOR N N W I 1 E U-V W 02 T3 E U-V Three-phase Measurement Diagram L1 I 1 L1 U I 1 T1 L2 I 2 E 1 W 01 INVERTER L2 V I 1 E U-V W 01 T2 MOTOR N I 3 E 1 W 02 L3 W I 1 E U-V W 02 T3 E 1 E U-V

14 6 14 Maintenance and Inspection Inverter Output Voltage Measurement Techniques Taking voltage measurements around drives equipment requires the right equipment and a safe approach. You are working with high voltages and high-frequency switching waveforms that are not pure sinusoids. Digital voltmeters will not usually produce reliable readings for these waveforms. And, it is usually risky to connect high voltage signals to oscilloscopes. The inverter output semiconductors have some leakage, and no-load measurements produce misleading results. So, we highly recommend using the following circuits to measure voltage for performing the equipment inspections. Voltage measurement with load Voltage measurement without load L1(L) L2 L3(N) Inverter U/T1 V/T2 W/T3 L1(L) L2 L3(N) Inverter U/T1 V/T2 W/T3 Additional resistor 5 kω 30W 220 kω 2W 220 kω 2W + + V Class Diode Bridge Voltmeter 200V Class 600V 0.01A min. 300V range 400V Class 100V 0.1A min. 600V range V Class Diode Bridge Voltmeter 200V Class 600V 0.01A min. 300V range 400V Class 100V 0.1A min. 600V range HIGH VOLTAGE: Be careful not to touch wiring or connector terminals when working with the inverters and taking measurements. Be sure to place the measurement circuitry components above in an insulated housing before using them.

15 L100 Inverter 6 15 IGBT Test Method The following procedure will check the inverter transistors (IGBTs) and diodes: 1. Disconnect input power to terminals [R, S, and T] and motor terminals [U, V, and W]. 2. Disconnect any wires from terminals [+] and [ ] for regenerative braking. 3. Use a Digital Volt Meter (DVM) and set it for 1Ω resistance range. You can check the status of the charging state of terminals [R, S, T, U, V, W, +, and ] of the inverter and the probe of the DVM by measuring the charging state. [+1] [+] D1 D2 D3 TR1 TR2 TR3 [R] [S] [T] + [U] [V] [W] D4 D5 D6 TR4 TR5 TR6 [ ] Table Legend Almost infinite resistance: Ω Almost zero resistance: 0 Ω Part DVM Measured DVM Measured DVM Part Part Value Value Measured Value D1 [R] +1 Ω D5 [S] [N] 0 Ω TR4 [U] [ ] 0 Ω +1 [R] 0 Ω [N] [S] Ω [ ] [U] Ω D2 [S] +1 Ω D6 [T] [N] 0 Ω TR5 [V] [ ] 0 Ω +1 [S] 0 Ω [N] [T] Ω [ ] [V] Ω D3 [T] +1 Ω TR1 [U] [+] Ω TR6 [W] [ ] 0 Ω +1 [T] 0 Ω [+] [U] 0 Ω [ ] [W] Ω D4 [R] [N] 0 Ω TR2 [V] [+] Ω TR7 [RB] [+] 0 Ω [N] [R] Ω [+] [V] 0 Ω [+] [RB] Ω TR3 [W] [+] Ω [RB] [ ] 0 Ω [+] [W] 0 Ω [ ] [RB] 0 Ω NOTE: The resistance values for the diodes or the transistors will not be exactly the same, but they will be close. If you find a significance difference, a problem may exist. NOTE: Before measuring the voltage between [+] and [ ] with the DC current range, confirm that the smoothing capacitor is discharged fully, then execute the tests.

16 6 16 Warranty Warranty Warranty Terms The warranty period under normal installation and handling conditions shall be two (2) years from the date of manufacture ( DATE on product nameplate), or one (1) year from the date of installation, whichever occurs first. The warranty shall cover the repair or replacement, at Hitachi's sole discretion, of ONLY the inverter that was installed. 1. Service in the following cases, even within the warranty period, shall be charged to the purchaser: a. Malfunction or damage caused by mis-operation or modification or improper repair b. Malfunction or damage caused by a drop after purchase and transportation c. Malfunction or damage caused by fire, earthquake, flood, lightening, abnormal input voltage, contamination, or other natural disasters 2. When service is required for the product at your work site, all expenses associated with field repair shall be charged to the purchaser. 3. Always keep this manual handy; please do not loose it. Please contact your Hitachi distributor to purchase replacement or additional manuals.

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